1. Firstly, we need to gather all the necessary materials for the project.
首先，我们需要收集所有项目所需的材料。

2. Firstly, let's discuss the main points of the presentation.
首先，让我们讨论一下演讲的要点。

3. Firstly, I want to thank everyone for coming to the party.
首先，我想感谢大家来参加派对。

4. Firstly, it is important to establish a strong foundation for your business.
首先，建立您的企业的坚实基础是很重要的。

5. Firstly, we must address the issues that are causing conflict within the team.
首先，我们必须解决团队内部导致冲突的问题。

6. Firstly, let's review the key concepts we discussed in the previous meeting.
首先，让我们回顾一下上次会议讨论的关键概念。